WO2019245566A1 - Procédé et appareil pour l'entretien des têtes d'impression - Google Patents

Procédé et appareil pour l'entretien des têtes d'impression Download PDF

Info

Publication number
WO2019245566A1
WO2019245566A1 PCT/US2018/038784 US2018038784W WO2019245566A1 WO 2019245566 A1 WO2019245566 A1 WO 2019245566A1 US 2018038784 W US2018038784 W US 2018038784W WO 2019245566 A1 WO2019245566 A1 WO 2019245566A1
Authority
WO
WIPO (PCT)
Prior art keywords
image
pixels
printing
nozzle
spit
Prior art date
Application number
PCT/US2018/038784
Other languages
English (en)
Inventor
Li Qian
Secundino VICENTE VICENTE
Marc BAUTISTA PALACIOS
Original Assignee
Hewlett-Packard Development Company, L.P.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/US2018/038784 priority Critical patent/WO2019245566A1/fr
Priority to US17/050,908 priority patent/US11660858B2/en
Publication of WO2019245566A1 publication Critical patent/WO2019245566A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04508—Control methods or devices therefor, e.g. driver circuits, control circuits aiming at correcting other parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head
    • B41J2/16526—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head by applying pressure only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head
    • B41J2/16526—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head by applying pressure only
    • B41J2/16529—Idle discharge on printing matter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head
    • H04N1/4015—Compensating positionally unequal response of the pick-up or reproducing head of the reproducing head
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/50—Picture reproducers
    • H04N1/506—Reproducing the colour component signals picture-sequentially, e.g. with reproducing heads spaced apart from one another in the subscanning direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2002/1657—Cleaning of only nozzles or print head parts being selected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2002/16573—Cleaning process logic, e.g. for determining type or order of cleaning processes

Definitions

  • printers operate by ejecting printing liquid, such as an ink, from a printhead in the printer onto a printing medium in determined locations in order to print an image on the printing medium.
  • the printing liquid used may be water or solvent based and may be stored in reservoirs or cartridges in the printer until used for printing an image.
  • the printing liquid may be ejected through a plurality of nozzles on the printhead as the printhead passes over a printing medium.
  • the printhead may include different nozzles for different coloured printing liquids.
  • the printhead may move across the printing medium during the printing operation in order to deposit printing liquid onto the printing medium at the correct location for forming the image.
  • a printhead may move from one side of a track to another side of the track as the printing medium is passed beneath the printhead.
  • the nozzles of the printhead may be capped when not in used in order to prevent evaporation of the printing liquid through the nozzles.
  • Figure 1 shows a printing system according to an example of the disclosure
  • Figure 2 shows a networked printing system according to an example of the disclosure
  • Figures 3a and 3b show image processing examples according to examples of the disclosure
  • Figure 4 shows a method according to an example of the disclosure
  • Figure 5 shows another method according to an example of the disclosure
  • Figure 8 shows another method according to an example of the disclosure
  • Figure 7 is a schematic block diagram of a computer system according to an example of the disclosure.
  • printers may include a printhead for ejecting printing liquid, such as an ink, through a nozzle, or a plurality of nozzles, during a printing image in order to form an image in the case when solvent or water-based printing liquid is used, a reduction in print quality may arise due to evaporation from the nozzles between printing liquid ejection, or firing, of the nozzles, which may reduce print quality as printing liquid dries out and partially or fully clogs the nozzle. This may obstruct the passage of printing fluid as it is ejected through the nozzle. To mitigate this, nozzles may be “capped” between use to prevent evaporation through the nozzles.
  • printing liquid such as an ink
  • a nozzle cap may be attached to the nozzle to cover the opening of the nozzle and form a seal to prevent exposure to external environments.
  • “decap” refers to a situation when a nozzle is not capped, and thus a situation where evaporation may negatively affect printing quality and nozzle health.
  • the printing liquid drying out on the nozzle may affect printing quality as when the nozzle is desired to be used for printing an image, passage of the printing liquid through the nozzle may be obstructed by ink residue, and consequently the printing liquid may not be deposited at the correct location on the printing medium.
  • the size of the drop of printing liquid may also be different to the desired drop size due to the level of dogging of the nozzle.
  • “decap time” of a nozzle is the shorter time of i) the amount of time since a nozzle was most recently decapped or serviced; and ii) the amount of time since a nozzle most recently ejected printing liquid. It is to be understood that in some examples, servicing of the nozzle may include ejecting printing liquid through the nozzle.
  • a printhead may include a plurality of nozzles which may be fired independently from one another. Therefore, each nozzle may have a different decap time. For example, a nozzle corresponding to a colour or print location that is infrequently used may spend more time in a state where the nozzle is neither capped nor fired as the printhead traverses across the printing medium, which may lead to a greater impact on nozzle health and printing quality for that particular nozzle.
  • the effects of decap on nozzle health and print quality may be mitigated by servicing the nozzle in a servicing area or ejecting printing liquid through the nozzle.
  • the passage of the ejected printing liquid may remove printing liquid residue from the nozzle.
  • the process of ejecting printing liquid through a nozzle for the purpose of cleaning the nozzle may be known as“spitting”.
  • Nozzle maintenance may be performed by spitting directly onto the printing medium.
  • the printhead nozzles may fire at times and locations other than those designated for forming the printed image and eject printing liquid onto the printing medium in order to clean the printhead nozzles.
  • This technique may be known as“spit on page”. Performing spit on page may mitigate rapid deterioration of nozzle health and printing quality associated with decap. For example, in the case where a nozzle is not used frequently for printing the image, spitting on the page with said nozzle may refresh the nozzle, which may increase print quality.
  • the dots formed on the print medium through the use of spit on page may be visible in the final printed output, depending on the texture and colour of the spat dots.
  • certain printing technologies may be particularly susceptible to visible dots associated with spit on page. For example, in dye sublimation printing, due to the dot gain after sublimation, spat dots may be more visible than with other printing techniques.
  • Certain examples described herein provide methods and systems for generating printed images while reducing artefacts in the desired print output caused by spit on page operation. For example, methods may be provided to analyse images to be printed and identify when spit on page operation may be disabled without impacting print quality.
  • Figure 1 shows a printing system 100 according to an example of the disclosure.
  • the printing system 100 may include a memory 1 10, reservoir 120, processor 130, print job processing engine 132, printhead 140 and a network module 150.
  • the skilled person will appreciate that a printing system 100 may comprise a number of other known components of which a description here is omitted, and that some components of the printing system 100 shown in figure 1 may be optional for the purposes of this disclosure.
  • the memory 1 10 may be configured to store instructions for the operation of the printing system.
  • the memory 1 10 may store instructions useable by the processor 130 to control the printing system 100 to print an image onto a printing medium.
  • Printhead 140 may include at least one nozzle for ejecting a printing liquid, such as an ink, an overcoat, a colour enhancer or the like, onto a printing medium to form an image.
  • the printhead 140 may perform a spit on page operation to clean the at least one nozzle of the printhead 140.
  • the printing system may operate on a printing medium.
  • the printing medium may be a substrate onto which the printing system 100 prints an image using the printhead 140.
  • the printing medium may be printing paper, cardboard, textiles, etc.
  • the printing medium may be physically moved by the printing system 100.
  • the printing medium may be a plurality of pages of printing paper which are kept in a storage part of the printing system 100 and passed one at a time through a space under the printhead 140 during printing.
  • the printing medium may be moved in a direction perpendicular to the direction of movement of the printhead 140 during printing.
  • the printing medium may be static during printing, and the printhead 140 may perform ail desired movement to print an image.
  • the printhead 140 may print an image onto the printing medium according to instructions received from the processor 130. That is, the printhead 140 may operate under the control of the processor 130.
  • the printhead 140 may be connected to reservoirs 120 or cartridges for storing printing liquid until use of the printing liquid is desired.
  • the printhead 140 may eject a plurality of printing liquids of different colours and may include different nozzles for ejecting different coloured printing liquids.
  • the printhead 140 may also include different nozzles for ejecting printing liquid onto different areas of the printing medium.
  • the printhead 140 may include means of capping the nozzles to prevent evaporation of the printing liquid, for example the printhead may include mechanical caps to cover an opening of a nozzle to prevent exposure to the external environment.
  • the printhead 140 may print onto the printing medium using printing liquid, which may be stored in a reservoir 120 until the printing liquid is to be used for printing of an image or for spitting.
  • the reservoir 120 may contain a single printing liquid or several different printing liquids.
  • the reservoir 120 may be sealed to protect the printing liquid from an external environment.
  • the printing system 100 may operate under the control of the processor 130.
  • the processor 130 may control the printhead 140 to print an image on the printing medium by ejecting printing liquid through the nozzles of the printhead 140 as the printhead traverses across the printing medium.
  • the processor 130 may include an image processor 132 and a print output module 134.
  • the image processor 132 may receive information relating to a print job from the network module 150, including at least one image to be printed, and provide an indication to a print output module 134 to indicate whether spit on page should be applied for the print job.
  • the image processor 132 may analyse the received print job and determine whether to apply spit on page based on properties of the images to be printed as discussed below.
  • Print output module 134 receives the indication from the image processor 132 and based on the indication generates spit on page dots for the print job, and controls the printhead 140 to spit printing liquid onto the print medium as required. For example, if an indication that spit on page should be applied is received from the image processor 132, the print output module 134 may merge a layer comprising spit on page dots with a layer comprising the one or more images to be printed to generate a print output file to be printed to the print medium by the printhead 140.
  • the printing system 100 of figure 1 may be, for example, an inkjet printing system, a dye sublimation printing system or a piezoelectric printing system.
  • the skilled person would understand that the example printing system 100 and the following methods disclosed herein should not be limited to a particular type of printing system, but may be applied to any printing system which uses printing liquid susceptible to evaporation and nozzles which may be maintained by ejecting printing liquid.
  • Figure 2 illustrates a different arrangement 200 in which an image processor 240 is located in a print server 220, which may be located in a cloud.
  • One or more client devices 210 may communicate print jobs to the print server 220.
  • the print server 220 may then dispatch the print job to a printing device 230 over a network connection.
  • the image processor 240 may process the print job at the print server 220 to determine whether spit on page should be applied when printing the print job and provide an indication to the printing device 230 along with the print job
  • the described image processing functionality may be performed on an external user station coupled to a printing system and the output file including an indication of where spit on page operation should be enabled transmitted to the printing system to be rendered to a print medium.
  • a driver software may be loaded on to the user system and may comprise information relating to decap times for one or more nozzles of the printhead 140.
  • Figures 3a and 3b shows an example print output that illustrate examples of operation of the image processor 132 of system 100.
  • Figure 3a illustrates a plurality of rows 302 of an image to be printed. Individual pixels to be printed in each row are shown as black squares.
  • the image processor analyses each row of the print job to identify spaces 304, 308 between pixels in a row, between which a nozzle is not activated. The image processor 132 uses this information to determine whether a nozzle of the printhead 140 would be expected to exceed its decap time when printing the image.
  • the image processor 132 identifies a row having a large spacing 304 between two consecutive pixels that exceeds a threshold spacing corresponding to a decap time of the nozzle, it may be determined that spit on page operation should be enabled to avoid possible reduction in print quality due to the effects of decap.
  • a nozzle may be activated regularly while printing the image to a print medium.
  • Figure 3b illustrates an example having more frequent activation of the nozzle.
  • the image processor 132 may determine that the spacing between consecutive pixels 314 of row 312 is less than the threshold distance in response to this determination, the image processor 132 will provide an indication that spit on page operation should be disabled when printing the print job.
  • the image processor 132 may analyse each row of a print job to determine whether the decap time of a nozzle will be exceeded by identifying if the threshold distance is exceeded for any two consecutive pixels on any row of the print file. If it is determined that the decap time of the nozzle will not be exceeded, spit on page operation may be disabled for the print job. In this way, artefacts in the finished printed product due to spit on page operation may be reduced or avoided when not required.
  • Figure 4 illustrates an example method 400 of analysing images to be printed to determine whether spit on page should be used.
  • at least one image is received 410 for printing.
  • Each row of the image is analysed individual to check 430 for pixels in that row.
  • SOP YES
  • pixels having an activation level less than a threshold level may not cause sufficient ink to be ejected by a nozzle to avoid possible decap issues. Therefore, only pixels having an activation level greater than the threshold activation level may be considered qualifying pixels.
  • the method of Figure 4 may be applied separately for each colour used in the image.
  • different colours may be associated with different nozzles of the printhead 140 and therefore decap times are monitored separately for each nozzle i.e. each row may be analysed to determine a maximum spacing between two consecutive qualifying pixels of each different colour.
  • the threshold distance may be different for nozzles corresponding to different inks.
  • information relating to acceptable decap times or threshold distances may be provided for each ink by a driver software or firmware associated with the printing device.
  • the threshold distance may be determined from the decap time based on a speed of operation of the printing device. For example, for an acceptable decap time of 1 s in at 60ips (inches per second) the threshold distance would be determined to be 60 inches (152 cm).
  • rows 302a to 3Q2e of the illustrated example comprise a spacing 304 greater than the threshold spacing, however, row 3Q2f has a smaller spacing 308 between qualifying pixels that may be less than the threshold distance. According to the example method of Figure 4, this would result in spit on page being enabled. However, in some examples, spit on page may only be enabled if a number of consecutive rows greater than a threshold number, e.g. 8, and thus even though rows 302a to 302e exceed the threshold distance, spit on page operation would still be disabled.
  • a threshold number e.g. 8
  • Figure 5 shows a method 500 according to an example of the disclosure that relies on multiple consecutive rows of the image exceeding a threshold spacing.
  • the method 500 of Figure 5 at least one image is received 510 for printing.
  • Each row of the image is analysed individual to check 530 for pixels in that row.
  • a maximum spacing between any two consecutive pixels is determined 540, and this maximum spacing is compared 580 against a threshold distance if if is determined that the maximum spacing is less than the threshold distance, the method moves on to the next row 550 and repeats the analysis for the next row.
  • SOP YES
  • the method 500 may only consider qualifying pixels having an activation level greater than a certain amount. Furthermore, the method may be applied separately to each ink or nozzle on a row, i.e. requiring a particular nozzle to exceed its threshold distance for the threshold number of rows before providing an indication to enable spit on page operation.
  • Figure 6 shows a method 800 according to an example of the disclosure.
  • print job information including at least one image is received 802, for example via network module 150 by a image processor 132.
  • the image processor 132 identifies 604, for each row of the image, two or more pixels of the row associated with a nozzle of the printhead 140.
  • the image processor 132 determines 808 whether a maximum spacing between any two consecutive pixels for the row exceeds a threshold distance.
  • the image processor 132 then provides 608 a spit on page enable indication based on the determination 606.
  • the indication may then be provided to print file generator 134 to incorporate spit on page dots into the image to be printed dependent on the indication
  • printhead or printhead nozzle“spitting” printing liquid could be referred to as the printhead or printhead nozzle "ejecting”,“firing” or“depositing” printing liquid.
  • FIG. 7 shows an example 700 of a device comprising a computer-readable storage medium 730 coupled to at least one processor 720.
  • the computer-readable media 730 can be any media that can contain, store, or maintain programs and data for use by or in connection with an instruction execution system.
  • Computer-readable media can comprise any one of many physical media such as, for example, electronic, magnetic, optical, electromagnetic, or semiconductor media. More specific examples of suitable machine-readable media include, but are not limited to, a hard drive, a random- access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory, or a portable disc.
  • the computer-readable storage medium comprises program code to: receive 702 print job information including at least one image, identify 704, for each row of the image, two or more pixels of the row associated with a nozzle of a printhead, determine 708 for each row if a maximum spacing between any two consecutive pixels exceeds a threshold distance, and provide 708 a spit on page indication based on the determination 706.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Ink Jet (AREA)

Abstract

Dans un exemple, l'invention concerne un procédé et un appareil de commande d'opération de projection sur page, le procédé comprenant la réception d'au moins une image à imprimer, pour chaque rangée d'une pluralité de rangées de l'image: identifier au moins deux pixels de la rangée de l'image à imprimer par une buse d'une tête d'impression, déterminer si un espacement entre deux pixels consécutifs parmi les deux pixels ou plus est supérieur à une distance seuil, et en réponse à une détermination que l'espacement entre les deux pixels consécutifs est supérieur à la distance seuil, fournir une indication que des points de projection sur page doivent être fournis lors de l'impression de l'image.
PCT/US2018/038784 2018-06-21 2018-06-21 Procédé et appareil pour l'entretien des têtes d'impression WO2019245566A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US2018/038784 WO2019245566A1 (fr) 2018-06-21 2018-06-21 Procédé et appareil pour l'entretien des têtes d'impression
US17/050,908 US11660858B2 (en) 2018-06-21 2018-06-21 Method and apparatus for printhead maintenance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2018/038784 WO2019245566A1 (fr) 2018-06-21 2018-06-21 Procédé et appareil pour l'entretien des têtes d'impression

Publications (1)

Publication Number Publication Date
WO2019245566A1 true WO2019245566A1 (fr) 2019-12-26

Family

ID=68983354

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2018/038784 WO2019245566A1 (fr) 2018-06-21 2018-06-21 Procédé et appareil pour l'entretien des têtes d'impression

Country Status (2)

Country Link
US (1) US11660858B2 (fr)
WO (1) WO2019245566A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD953739S1 (en) * 2019-09-13 2022-06-07 Apple Inc. Case
USD907009S1 (en) * 2019-09-20 2021-01-05 Apple Inc. Case with earphones

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150049137A1 (en) * 2012-03-02 2015-02-19 Oce-Technologies B.V. Dot detection method and color image reproduction apparatus
US20170348978A1 (en) * 2015-01-12 2017-12-07 Agfa Graphics Nv Inkjet printing method for decorative images
US20180126750A1 (en) * 2016-10-25 2018-05-10 Memjet Technology Limited Method of printing foreground and background images with overlapping printhead segments

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100242853B1 (ko) 1996-12-19 2000-03-02 미다라이 후지오 잉크 배출량의 측정 방법 및 장치, 인쇄 장치, 및인쇄 장치에서의 잉크 배출량 측정 방법
US7044585B2 (en) * 2000-05-23 2006-05-16 Silverbrook Research Pty Ltd Method of generating halftone print data for overlapping end portions of printhead chips
US6402287B2 (en) 2000-06-05 2002-06-11 Fuji Photo Film Co., Ltd. Printing method and printer capable of inspecting printing head
US7914110B2 (en) 2007-01-31 2011-03-29 Hewlett-Packard Development Company, L.P. Purging fluid from fluid-ejection nozzles by performing spit-wipe operations
JP2010036382A (ja) 2008-08-01 2010-02-18 Seiko Epson Corp 液滴吐出装置のフラッシング制御方法と液滴吐出装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150049137A1 (en) * 2012-03-02 2015-02-19 Oce-Technologies B.V. Dot detection method and color image reproduction apparatus
US20170348978A1 (en) * 2015-01-12 2017-12-07 Agfa Graphics Nv Inkjet printing method for decorative images
US20180126750A1 (en) * 2016-10-25 2018-05-10 Memjet Technology Limited Method of printing foreground and background images with overlapping printhead segments

Also Published As

Publication number Publication date
US11660858B2 (en) 2023-05-30
US20210229424A1 (en) 2021-07-29

Similar Documents

Publication Publication Date Title
EP2720872B1 (fr) Système d'impression
US9757941B2 (en) Image content based spit bars
EP3219496B1 (fr) Système et procédé de compensation pour jets d'encre défectueux
US11660858B2 (en) Method and apparatus for printhead maintenance
US20160107438A1 (en) Printer operation for ejection of purging droplets of a printing fluid
US8882236B1 (en) System and method for compensating for defective inkjets ejecting black ink in solid fill areas
US10889111B2 (en) Method and printer for reducing intensity fluctuations
US10322579B2 (en) Inkjet printing system and method to reduce system-dependent streaking
CN104290448B (zh) 打印设备和打印方法
JP5480460B2 (ja) 印刷システム、および媒体上に画像を形成する方法
US11379163B2 (en) Method and apparatus for printhead maintenance
US12109822B2 (en) Textile printing servicing operations
US11498337B2 (en) Printhead and printhead maintenance
US9662879B2 (en) Method to improve the system stability of inkjet printing systems
US9849676B2 (en) Printer including a spit zone
US10118386B2 (en) Method to activate a nozzle arrangement of an inkjet printing system
CN109641463B (zh) 打印头处的间隙喷吐
US6739684B1 (en) Burst mode printing to compensate for colorant migration
EP0924076A3 (fr) Appareil d'enregistrement à jet d'encre, procédé de contrôle d'enregistrement et support de mémorisation avec programme de contrôle mémorisé
US20240296301A1 (en) Decap time and printing data
JP2016135577A (ja) インクジェット印刷方法およびインクジェットプリンター
US11999166B2 (en) Adaptive ink flushing of overlap nozzles of a printer
US8876238B2 (en) Image recording apparatus, method for producing test pattern in the same, and nontransitory storage medium storing program
US20180345662A1 (en) Dividing printer spits into bursts
US20050253894A1 (en) Printing system and method

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18923049

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18923049

Country of ref document: EP

Kind code of ref document: A1